基于DM642的MPEG-4视频编解码系统的优化实现  

Optimization and implementation of MPEG-4 video encoder and decoder system based on DM642

作　　者：周妍[1] 朱金秀[1] 

机构地区：[1]河海大学计算机及信息工程学院

出　　处：《河南理工大学学报（自然科学版）》2009年第5期607-612,共6页Journal of Henan Polytechnic University（Natural Science）

摘　　要：为了实现基于TMS320DM642的MPEG-4视频编解码系统,提出了系统的设计方案和实现流程框架,实现了视频采集输入、编解码处理和视频输出显示等模块的功能,并针对DM642的硬件特点,提出了系统优化的总体策略.分别从程序流程结构调整、C代码优化、线性汇编代码优化、存储器系统合理配置和使用EDMA等方面对编解码系统进行优化,提高代码的并行性和程序的运行速度.通过这些优化,最终实现了基于DM642的MPEG-4实时视频编解码.目前该系统可以实时编解码一路CIF格式的视频序列,速度均在25 f/s以上,可应用于实时视频监控系统中.To implement MPEG-4 video encoder and decoder system based on TMS320DM642,the system design scheme and implementation flow framework are presented.The video capture and input module,video encoding and decoding processing module,video output and display module are implemented.The whole optimization techniques are proposed based on the hardware characteristics of DM642.The techniques of program flow adjustment,C language code optimization,linear assembly code optimization,distribution of memorizer space and EDMA transfers are used to improve the code parallelism and running speed.Finally,MPEG-4 real-time video encoder and decoder are implemented through the optimization techniques based on DM642.At present,the encoder and decoder can deal with CIF format video sequences at the speed of more than 25fps,and can be applied to the real-time video surveillance system.

关 键 词：TMS320DM642 MPEG-4 视频编解码系统 

分 类 号：TN919.81[电子电信—通信与信息系统]